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ANEK [815]
4 years ago
7

How long do balloons stay inflated with helium

Chemistry
1 answer:
mel-nik [20]4 years ago
7 0

Answer:

Balloons last between 12-21 hours filled with helium

<em>Explanation</em>:

<em>latex balloons generally last between 12-20 hours filled with helium, and about 2-3 days when treated with Hi-Float</em>

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i need help ls i thank its book 500 grams

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What are the different elements that make up a molecule of glucose?
Yanka [14]

Answer:

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Explanation:

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3 years ago
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Compared to the ideal bond angle, the actual/real bond angle in a molecule of water will be:______.
inna [77]

Answer: d. smaller.

Explanation:

Hybridization :

N=\frac{1}{2}[V+N+A-C]

N = number of electrons

where, V = number of valence electrons present in central atom i.e. oxygen = 6

N = number of monovalent atoms bonded to central atom=32

C = charge of cation = 0

A = charge of anion = 0

The number of electrons is 4 that means the hybridization will be sp^3 and the electronic geometry of the molecule will be tetrahedral.  The bond angle for tetrahedral geometry is 109.5^0

But as there are two atoms around the central oxygen, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent and the bond angle will be smaller than expected and is 104.5^0

8 0
3 years ago
Which of the following would indicate that a chemical change might be occurring?
vitfil [10]
D. Is the best indicator for a chemical change.
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Which of the following is NOT part of the kinetic molecular theory of gases?
kondaur [170]

A. There is very little empty space in a gas in not part of the kinetic molecular theory of gases.

Explanation:

The kinetic molecular theory of gases follows following points:

Kinetic energy does not change or get dissipated when gas molecules collide with each other. No attraction or repulsion between gas particles is observed. Particles of  gas are moving randomly in all directions. Temperature increase cause the rapid movement of gas particles.The gas particles are placed very far from each other as compared to liquid.

The empty space in a gas is large because gas gets compressed in the small volume of the container also.

7 0
3 years ago
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